I seems have a trouble with Z-order. I have a layout called "HUD" which is globally used in all other layouts(levels). In HUD layout, I have a PauseMenu layer which have pausemenu buttons and a tilebackground object. the background object is behind buttons. It works fine if I only load the HUD layout, then when I load a game level, the "HUD" layout is also called, but the tilebackground jump in front of the buttons. :(
I can't figure out why..